Radio receiving apparatus



R. E. HUMPHREY RADIO RECEIVING APPARATUS Dec. 25, 1928.

Filed Nov. 5, 1924 Patented Dec. 25, 1928.

UNITED STATES PATENT (OFFICE.

REGINALD 1:. many, or swm'rom vnamonr.

' My inveiition relates broadly to a radioreceiving system and moreparticularl to a circult arrangement for an electron tu e system at aradio receiving station wherein the funcprovide an in\expensive form ofradio receiv-.

odes and anodes for dontrollin am tions of radio fre uencyamplification, rectification and audio equency amplification may besimultaneously erformed without the generation of 0 cillatlons ordisturbing currents in the radio receiving system.

, One of the objects of my invention is to mgapparatus having a highdegree of eifi clency and capable of volume reception of the incominsign lin ener y.

Anoth er obj ct if my invention. is to provide an arrangement ofelectron tube and c' cuit therefor'vs herein the tube functions s1-multaneously asa radio frequency amplifier, a rectifier and anaudiofrequency amplifier.

Still another object of my invention is to provide a construction ofelectron tube including a plurality of setsvof electrodes, one set ofwhich seq-Wes for the amplilfication o; incoming signa in ener at aurality 0, different frequencisywli il e the gther set of electrodesoperates to produce the said difference in frequency by a process ofrectification.

A- still further object of my invention is to provide a tubeconstruction wherein an evacuated vessel is provided with a pair ofcathodes and a pair of anodes with a con 01 electrode interposed betweenone of sad cathification of energy at both radio and audio frequencieswhile the other cathode and anode are arranged for the rectification ofelectrical ener y.

invention contemplates the provision of a circuit for radio receivingsystems wherein a single tube may be employed to produce a greatervolume amplification of the incoming signaling energy than. hasheretofore been ossible. It is unnecessay to employ auxiliaryrectificationdevices with the tube of my invention by reason of theinherent'rectification powers possessed by the tube in addition to itspowers of amplification at diiferentfrequenmes. 4

M invention will be more clearly understoo b reference to the followingspecification an from the accompanying drawings. in which: 0

Figure 1 illustrates the appllcatlon of the electron tube of m inventionto a radlo re arrangement of the plurality of sets of electrodes withinthe evacuated vessel.

Heretofore in the art it has been proposed to amplify incoming signalingenergy at a dio frequencies. It has been necessary to utilize aplurality of three electrode tubes in order to accomplish'desirableresults or it has been necessary to utilize a rectifier of the -crystalvariety in reducing the frequency of the incoming ra io frequency energyto a readily amplifiab io frequency at which radio receiving station atboth radio and authe signals might be observed The employment of thisapparatus lends complications in a radio receiving system which iscmployed'as a receiver of broadcast entertainment by a novice or oneunskilled in the art. The employment of a number of individual pieces ina broadcast receiver requires independentadjustment of several controlsby an operator who may be unskilled in the art with the result thatimperfect reception is secured. Furthermore the several pieces ofapparatus heretofore required have een undesirable sources ofexpense'and it is the purpose of my present invention to provideasimplified artrangement of radio broadcast receiver wherein the tube andthe circuit provided for the tube performs simultaneously a plurality offunctionswithout undesirable oscillation, regeneration or reradiation ofthe signaling energy;

Referring more particularly to the draw- 5 is coupled to the primary winmg 4 and is tuned by secondary condenser 7. The elec; tron tubecomprises an evacuated vessel 8,

f. Y supports 9 and 10 at one end of t'hf fiitube and 11 and 12 at beother endof the tube between which the filamentary cathodes 14 and 15are'supported. Connections 16 and I 17 are brought out from the oppositeterminals of the, Y supports and taken to the oathode heatin' circuit. Acontrol electrode 18 .is provide adjacent .the cathode 15 'ee nnectedwith the external circuit through con- -ductor 19. A plate or anodeelectrode 20'is positioned adjacent the control electrode 18 and in aposition to receive electronic bomceiving circuit; anFigifishowsindetail bardment from cathode 15. A connection winding tarycathode 14.

-tion circuit.

anode 20 of the tube as represented at 20 The other anode 21 of the tubeis disposed adjacent cathode 14 and is connected with the externalreceiving circuit through lead 21. Radio frequency signaling energy isimpressed on the input circuit of the electron tube by connectionsextending fronr the tuned circuits 5 and 7 through the conductor19 tocontrol electrode 1.8 and from the other side of the tuned circuitthrough a condenser 28 and a connec ti on back to the cathode 15. Thecircuit described forms the input circuit for the tube operated at radiofrequency. The output circuit formed by anode 20, lead 20 primarywinding 23 of the radio frequency transformer 22. condenser 26, highpotential battery 27 and a return connection to the cathodes 14 and 15.The transformer 22 is provided with a secondary winding 24 in whichamplified radio'frequency energy is cvistent having been transferredfrom the primary winding'28. The secondary winding 24 is connected incircuit with primary 31 of audio frequency transformer 29 with areturnconnection to the filamen- The other side of thesecnudary winding24: connects with anode 21 through lead 21 completing the rectifica- Thefilamentary cathodes 14 and 15 are heated to incandescence from a sourceof potential. 32 under control of rheostat 33. The audio frequencytransformer 29 operates to transfer energy from the priis brought outfrom mary Winding 31 to the secondary winding {3-0 at audio frequency,which energy is again mpressed upon the input circuit comprising;control electrode 19 and cathode 15 whereby the energy 1seonsiderablyfamplified and finally caused to operate responsive devicein the output circuit of the set of electrodes comprising theamplification system of the tube.

It Will be observed that the electron tube contains one set ofelectrodes independent from another set of electrodes with circuitconnections between the electrodes arranged for the amplification of theincoming signaling energy at adio frequency, next the rectification ofthe said energy and finally the amplification of the rectified energy ataudio frequency. In this manner a. plurality of functions are performedby the same electron tube and the receiving system is simplified and itscost reduced so that it is readily available to the general public.

While I have described my invention in certain particular embodiments Idesire that it be understood that modifications may be made and that Iintend no limitations upon the invention other than those imposed by thescope of the appended claim.

What I claim and desire to secure by Let- 'tersPatent ofthe UnitedStates is as follows An electron tube structure comprising incombination an evacuated vessel, a pair of Y-shaped conductive membersextending into said evacuated vessel with the axes thereof centered oneover the other and aligned with each other at opposite ends thereof, apair of filamentary cathodes supported from the extremities of saidY-shaped conductive members, an anode mounted adjacent one of saidfilamentary cathodes, and a grid and .anode mounted adjacent the otherof said filamentary cathodes. v

REGINALD E. HUMPHREY.

